Li Peng-Fei, Hu Chun-Li, Kong Fang, Mao Jiang-Gao
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, 350002, P. R. China.
University of Chinese Academy of Sciences, Beijing, 100049, P. R. China.
Angew Chem Int Ed Engl. 2023 Apr 17;62(17):e202301420. doi: 10.1002/anie.202301420. Epub 2023 Mar 14.
It is a great challenge to develop UV nonlinear optical (NLO) material due to the demanding conditions of strong second harmonic generation (SHG) intensity and wide band gap. The first ultraviolet NLO selenite material, Y F(SeO ) , has been obtained by control of the fluorine content in a centrosymmetric CaYF(SeO ) . The two new compounds represent similar 3D structures composed of 3D yttrium open frameworks strengthened by selenite groups. CaYF(SeO ) has a large birefringence (0.138@532 nm and 0.127@1064 nm) and a wide optical band gap (5.06 eV). The non-centrosymmetric Y F(SeO ) can exhibit strong SHG intensity (5.5×KDP@1064 nm), wide band gap (5.03 eV), short UV cut-off edge (204 nm) and high thermal stability (690 °C). So, Y F(SeO ) is a new UV NLO material with excellent comprehensive properties. Our work shows that it is an effective method to develop new UV NLO selenite material by fluorination control of the centrosymmetric compounds.
由于对强二次谐波产生（SHG）强度和宽带隙的苛刻条件要求，开发紫外非线性光学（NLO）材料是一项巨大挑战。通过控制中心对称的CaYF(SeO )中的氟含量，首次获得了紫外NLO亚硒酸盐材料Y F(SeO ) 。这两种新化合物具有相似的三维结构，由亚硒酸盐基团强化的三维钇开放框架组成。CaYF(SeO )具有大的双折射（532 nm处为0.138，1064 nm处为0.127）和宽的光学带隙（5.06 eV）。非中心对称的Y F(SeO )可表现出强SHG强度（1064 nm处为5.5×KDP）、宽带隙（5.03 eV）、短紫外截止边（204 nm）和高热稳定性（690 °C）。因此，Y F(SeO )是一种具有优异综合性能的新型紫外NLO材料。我们的工作表明，通过对中心对称化合物进行氟化控制来开发新型紫外NLO亚硒酸盐材料是一种有效的方法。
